在知道中大家都在讨论氢氧化亚铁的颜色问题，我在教学中发现：纯氢氧化亚铁是白色的。
Everyone in the know in the discussion of the color of ferrous hydroxide, I found in teaching: purity of ferrous oxide is white.
笔者在教学过程中发现，应用此种方法分析电路问题时，常会遇到本文所述的三种情况。
During the teaching, the writers found that applying this method to analyze the circuit problem often meet with three kinds of situation mentioned in this article.
笔者在教学过程中发现，应用此种方法分析电路问题时，常会遇到本文所述的三种情况。
During the teaching, the writers found that applying this method to analyze the circuit problem often meet with three kinds of situation mentioned in this article.
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